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Provide a safe atmosphere for swimming by destroying bacteria, algae and other harmful contaminants. Additionally, maintain a nice water clarity. Calcium hypochlorite (Cal-Chlor) granules will provide you with the sanitizing power you need to keep your swimming pool or spa water crystal clear and safe for your swimmers.

Cal-Chlor granules are designed for sanitizing swimming pools and spas. Calcium hypochlorite (Cal-Chlor) granules are widely used throughout the swimming pool industry for disinfecting water as they are extremely effective at killing and deactivating harmful contaminants such as bacteria, algae and other microorganisms. Cal-Chlor granules can be used on a routine basis to keep your pool or spa water clean and can also be used for shock treatments when extra sanitizing power is required to kill organic contaminants.

By destroying bacteria, algae and other harmful contaminants, calcium hypochlorite pool chemicals provide a safer swimming environment while also improving and maintaining water clarity. Calcium hypochlorite (Cal-Chlor) granules will provide you with the sanitizing power you need to keep your swimming pool or spa water crystal clear and safe for your swimmers.

Guardex®, Bioguard®, Aquabrome®, Polysheen®, BurnOut®, Burnout 35®, Softswim®, Pool Magnet®, Chlorite®, Algae All 60 and MSA Algaecide are registered trademarks of BioLab, Inc. Pace® is a registered trademark of Arch Chemicals. In The Swim® is not affiliated with them and does not carry their products. The use of Sun®, Guardex®, Bioguard®, Pace®, and Leslies and their logos is for comparison purposes only.

Rated 5 out of
5 by
Happy Pool from
ChemicalsBest price for good product. Chemicals work. Shipping is easy.

Date published: 2017-10-17

Rated 5 out of
5 by
Donny from
ELIMINATED BY CYANURIC ACID PROBLEMI bought this product as it does not contain cyanuric acid which had built up in my pool. I had to drain about 1/2 of the water out of my pool to reduce the acid level. I will only use Calcium Hypochlorite in the future as my form of chlorine. You have to be careful, however, as calcium hypochlorite will increase the ph some.

Date published: 2017-09-11

Rated 5 out of
5 by
DrJaykay from
costs less per pound than equivalent shockIt comes with a measuring scoop, so it's easy to shock the pool with the right amount. Seems to be the same stuff as 68% chlorine shock

Date published: 2017-09-08

Rated 5 out of
5 by
Krinn11 from
Works great, has a larger scoop than other brands I've bought which is more convenient. Lid seals tight keeping moisture out. Great product for the price. Will definitely buy again.

Date published: 2017-08-24

Rated 4 out of
5 by
PORKCHOPPAT from
Calcium Hypochlorite Sanitizing Granules ReviewFirst time using the product works well. For the price I just wish it would of came with a measuring cup to properly sanitize the pool weekly. I recommend opening the product outside. When the box came I opened it up in my family room and to my surprise the bottom of the box was filled with loose Calcium Hypochlorite Sanitizing Granules.

Date published: 2017-08-22

Rated 5 out of
5 by
swimmer from
It works!This year I need extra help to keep my pool clear. This product does the jab.

Date published: 2017-08-10

Rated 5 out of
5 by
Joser20706 from
Great!Totally worth the money, my pool is so clear. I would recommend to everybody.

Date published: 2017-08-05

Rated 5 out of
5 by
will k from
excellent as alwaysgreat products, prices and delivery keep up the good work!

In The Swim granular Cal-Chlor is perfect for super shocking or everyday use. It is ph balanced to help reduce eye and skin irritation.

The Cal-Chlor is 68% available chlorine and 35% calcium. “Same as ITS pool shock”.

In the Swim recommends to pre-dissolve in water before adding to the pool. This is done to prevent bleaching and reduce clouding of the pool water.

If using as a weekly shock you will use 16oz. per 10,000 gallons.

If using as your main sanitizer you will use the following:

For unstabilized pools use 6-8 oz. per 10,000 gallons daily.

For stabilized pools use 3-4 oz. per 10,000 gallons every other day.

Dosages may vary to keep chlorine in 1-3 ppm range.

What are the Cal-Chlor sanitizing granules comparable to?

– In The Swim Cal-Chlor is calcium hypochlorite. The Cal-Chlor is comparable to HTH, Pulsar and Chloryte.

What is the chemical make up of the Cal-Chlor sanitizing granules?

– In The Swim Cal-Chlor are 68% available chlorine and 35% calcium. Cal-Chlor is non- stabilized.

How much Cal-Chlor do I use a week?

– If using as a weekly shock you will use 16oz. per 10,000 gallons. – If using as your main sanitizer you will use the following: – For unstabilized pools use 6-8 oz. per 10,000 gallons daily. – For stabilized pools use 3-4 oz. per 10,000 gallons every other day. – Dosages my vary to keep chlorine in 1-3 ppm range.

How do I dispense my Cal-Chlor?

– In The Swim recommends to predissolve prior to broadcasting in the pool. This will prevent bleaching of the liner and help reduce in clouding of the pool water. In The Swim recommends having a bucket of water, and adding chemicals to the bucket of water and then introduce to the pool.

Troubleshooting:

– If chlorine seems ineffective make sure you are dispensing the correct amount of chlorine. For best results, dissolve in water before adding to pool.

– If using as a weekly shock you will use 16oz. per 10,000 gallons.

– If using as your main sanitizer you will use the following: – For unstabilized pools use 6-8 oz. per 10,000 gallons daily. – For stabilized pools use 3-4 oz. per 10,000 gallons every other day. – Dosages may vary to keep chlorine in 1-3 ppm range.

– If chlorine still seems to be ineffective check the stabilizer also known as cyanuric acid. The correct level for stabilizer is 30-60 ppm. If the stabilizer is too low the chlorine will be used up faster making it appear that the chlorine is not effective. If the stabilizer level is too high it will slow down the oxidizing process and render the chlorine less effective. This must be compensated for by using a higher concentration of chlorine in the pool water.

– If the chlorine seems to be defective/ineffective, you can test by putting a small amount of Cal-Chlor into a glass of tap water. (Do not use pool water.) Dissolve and test as usual.

More Information

65% Available Chlorine (35% Calcium) Must dilute to prevent bleaching of the liner.